scx_kaddr_to_arena(9)

💅 scx_kaddr_to_arena(9) — like, the kernel API manual, bestie

okay so real talk, this one's from the Kernel API Manual (scx_kaddr_to_arena(9), section 9, kernel-level stuff, iykyk) and it's honestly such a small page but it's load-bearing okay 💖

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✨ NAME ✨

scx_kaddr_to_arena — translate a kernel arena address to the BPF form 🦋

like yes that's the whole job and she does it flawlessly

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🌸 SYNOPSIS 🌸

uintptr_t scx_kaddr_to_arena (struct scx_sched *sch , const void *kaddr
);

copy it exactly, don't @ me, the spacing is what it is 💀

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🎀 ARGUMENTS 🎀

• sch — the scheduler whose arena is hosting kaddr — think of her as the hostess with the mostest, she's literally the one holding the arena 👑
• kaddr — a kernel address that lives inside sch's arena 🌈

both of these are mandatory bestie, no defaults, no shortcuts, just vibes and values 💅

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🔥 DESCRIPTION 🔥

so here's the tea ☕

__arena callback arguments need no translation — they're already serving looks in the right form, they woke up like this, no filter needed ✨

but addresses that get handed to BPF any other way? like, say, struct fields or kfunc return values? those go through this function. this is their little glow-up station. their main character transformation arc 💖

and no, we don't skip it, because untranslated addresses are giving "wrong address on the group chat" energy and nobody wants that 😭

⭐ genuinely: __arena callback args = already fine, leave them alone. everything else that crosses into BPF = run it through scx_kaddr_to_arena. that's the whole rule, bestie.

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👀 SEE ALSO 👀

the whole friend group, all linked, all iconic, all in ./kernel/sched/ext/internal.h (the kernel file, yes, that one) 🫶

• scx_add_event(9)
• __scx_add_event(9)
• struct scx_enable_args(9)
• struct sched_ext_ops(9)
• struct sched_ext_ops_cid(9)
• scx_arena_to_kaddr(9) ← yes this is the other direction, she's the reverse-translation sister, obsessed 🦋
• DEFINE_SCX_COMPAT_MARKER(9)
• scx_root_protected_live(9)
• scx_root_protected(9)
• scx_bypass_dsp_enabled(9)
• scx_ops_sanitize_err(9)
• scx_has_subs(9)
• scx_task_sched(9)
• scx_task_sched_rcu(9)
• scx_task_on_sched(9)
• scx_prog_sched(9)
• scx_parent(9)

all of these are getting a follow-back, periodt 💅

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okay that's the page!! 🎀 this little cutie lives in ./kernel/sched/ext and the version is October 2026 — that's the whole source/version/date situation, mwah, love that for us, byeee 💖✨🧚